A recent study of the International Data Corporation (2008) has examined the role of IT cloud services across five major product segments representing almost two-thirds of total enterprise IT spending (excluding PCs): business applications (SaaS), infrastructure software, application development & deployment software, servers and storage. Out of the $ 383 billion that firms have spent in 2008 for these IT services only $ billion (4%) could be classified as cloud services. In 2012 the total figure was expected to be at $ 494 billion and the cloud part at $ 42 billion, which would correspond to 9% of customer spending, but also to a large part.
